Remove internal/content package and use engine directly

- Eliminate content.Enhancer wrapper around engine.ContentEngine
- Update cmd/enhance.go to call engine.ProcessFile/ProcessDirectory directly
- Update sites/manager.go to use engine.NewContentEngineWithAuth directly
- Remove unused EnhancementConfig and discovery configuration logic
- Simplify enhance command to use input path as site ID
- Remove CLI config dependency from config package

internal/sites/manager.go

@@ -9,7 +9,6 @@ import (
 	"sync"
 
 	"github.com/insertr/insertr/internal/config"
-	"github.com/insertr/insertr/internal/content"
 	"github.com/insertr/insertr/internal/db"
 	"github.com/insertr/insertr/internal/engine"
 	"maps"
@@ -18,7 +17,6 @@ import (
 // SiteManager handles registration and enhancement of static sites
 type SiteManager struct {
 	sites         map[string]*config.SiteConfig
-	enhancer      *content.Enhancer
 	mutex         sync.RWMutex
 	devMode       bool
 	contentClient db.ContentRepository
@@ -29,7 +27,6 @@ type SiteManager struct {
 func NewSiteManager(contentClient db.ContentRepository, devMode bool) *SiteManager {
 	return &SiteManager{
 		sites:         make(map[string]*config.SiteConfig),
-		enhancer:      content.NewDefaultEnhancer(contentClient, ""), // siteID will be set per operation
 		devMode:       devMode,
 		contentClient: contentClient,
 		authProvider:  &engine.AuthProvider{Type: "mock"}, // default
@@ -151,31 +148,11 @@ func (sm *SiteManager) EnhanceSite(siteID string) error {
 		return fmt.Errorf("failed to create output directory %s: %w", outputPath, err)
 	}
 
-	// Create enhancer with auth provider for this operation
-	// Discovery disabled by default - developers should explicitly mark elements with class="insertr"
-	discoveryConfig := config.DiscoveryConfig{
-		Enabled:    false, // Changed from true - respect developer intent
-		Aggressive: false,
-		Containers: true,
-		Individual: true,
-	}
-
-	// Override with site-specific discovery config if provided
-	if site.Discovery != nil {
-		discoveryConfig = *site.Discovery
-		log.Printf("🔧 Using site-specific discovery config for %s: enabled=%v, aggressive=%v",
-			siteID, discoveryConfig.Enabled, discoveryConfig.Aggressive)
-	}
-
-	config := content.EnhancementConfig{
-		Discovery:        discoveryConfig,
-		ContentInjection: true,
-		GenerateIDs:      true,
-	}
-	enhancer := content.NewEnhancerWithAuth(sm.contentClient, siteID, config, sm.authProvider)
+	// Create content engine with auth provider for this operation
+	contentEngine := engine.NewContentEngineWithAuth(sm.contentClient, sm.authProvider)
 
 	// Perform enhancement from source to output
-	if err := enhancer.EnhanceDirectory(sourcePath, outputPath); err != nil {
+	if err := contentEngine.ProcessDirectory(sourcePath, outputPath, siteID, engine.Enhancement); err != nil {
 		return fmt.Errorf("failed to enhance site %s: %w", siteID, err)
 	}